I am testing this on my 91-year-old mother who has a dark spot on her forehead, the residue from a fall more than a year ago. Maybe because I live in the UK and the product took longer to receive and not enough time has passed using the diminisher to shout complete success. It has certainly faded and my mother who is fully compos mentis, is faithfully applying it as prescribed, and after only ten days.
Bottom Line: Yes, I would recommend this to a friend